Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
Could you please check the wrong one if you have already set the primary category?
If the issue persists, we might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
Thank you, and we really look forward to helping you.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Thanks for your reply.
I thought the same, changed, and nothing happened.
Sensitive data updated.
Thanks
Hello,
Thanks for reaching out. I’m sorry for the inconvenience this may have caused.
Can you please make sure that your Primary Taxonomy is set to “Categories”?
You can check it by going to Rank Math > Titles & Meta > Post types > Posts > Primary Taxonomy > Select Categories.
Here’s a sample screenshot: 
Hope this helps.
Hi,
Thanks but it was already done.
Problem is still there
Hello,
Thank you for contacting Rank Math again.
I fixed this by re-creating again the page. I think something happens upon publishing the post that’s why the breadcrumbs behave that way.
As you can see the new page breadcrumbs working fine now. (Attached in the Sensitive Data section)
I hope this helps. Thank you, and looking forward to your update.
Hi,
Thanks, I have just tried on a new page, and it works.
Although, I have many pages with this issue. Will I have to change them all manually or would there be a faster way?
Also, can you remove the visible url’s from the discussion please?
Thanks,
Hello,
Thank you for the follow-up.
I’ve already moved the image to the sensitive Data section as requested.
For the posts that are still showing the wrong breadcrumbs structure, have you built them before using a different template?
I hope that helps. Thank you, and looking forward to your update.
Hi,
Thanks for moving the pictures.
Yes they were created before the template.
Regards,
Hello,
Thank you for the follow-up.
In this case, you would need to re-create and update those posts manually since the changes would only apply to the new posts.
I hope that helps. Thank you, and please don’t hesitate to contact us if you need further assistance.
Ok.
Thanks for the help.
I’m marking the issue as solved.
Hello,
We are super happy that your issue is resolved. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.